Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
chieu tinh » trieu tinh, lieu tinh, chau tinh
hiem ngan » kim ngan, viem gan
trung tac » trung tam, trong tac, trung tai
trong san » trong cac, cong san, dong san
tac dung » sach dung, xay dung, tin dung
san van » tan van, luan van, tran van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hiem ngan) or (chieu tinh)) - hanh trung tac dung trong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hiem ngan) OR (chieu tinh)) - hanh trung tac dung trong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hiem ngan) or (chieu tinh)) - hanh trung tac dung trong san van ban*.